people also ask：
baike
mobile
I ASK
QuesHub APP
QuesHub > 两种 > 煤炭 > 表面 > ASK DETAIL

What are the two main methods of coal mining?

Gabriel Wilson | 2023-05-28 16:12:41 | page views：1384
I'll answer
Earn 20 gold coins for an accepted answer.20 Earn 20 gold coins for an accepted answer.
40more
Best Answer | Search More answer on queshub>>

Oliver Gonzalez

Works at the International Criminal Court, Lives in The Hague, Netherlands.
There are two basic methods to remove coal: surface mining and underground mining. Surface mining is used when the coal is typically less than 200 feet below the surface. Giant machines are used to remove the top layers of soil and rock to expose the coal.
2023-05-30 16:12:41
评论(499) Helpful(122)

Daniel Moore

QuesHub.com delivers expert answers and knowledge to you.
There are two basic methods to remove coal: surface mining and underground mining. Surface mining is used when the coal is typically less than 200 feet below the surface. Giant machines are used to remove the top layers of soil and rock to expose the coal.
Coal Mining Technologies
ORG URL>>
首页 上一页 1 NEXT  LAST
  • 0
    0
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    9
  • 0
    1
    2
    3
    4
    5
    6
    7
    8
    9
    0
    1
    2
    3
    4
    5
    6
    7
    8
    3

people are using QuesHub for answers.

Me Too.
RunTime:0.8306 || DBTime : 0

HOT TOPIC

ask:3,asku:1,askr:137,askz:21,askd:152,RedisW:0askR:3,askD：0 mz:hit,askU:0,askT:0askA:4